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PDF SG3525A Data sheet ( Hoja de datos )
| Número de pieza | SG3525A | |
| Descripción | REGULATING PULSE WIDTH MODULATORS | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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SG2525A
® SG3525A
REGULATING PULSE WIDTH MODULATORS
. 8 TO 35 V OPERATION
. 5.1 V REFERENCE TRIMMED TO ± 1 %
. 100 Hz TO 500 KHz OSCILLATOR RANGE
. SEPARATE OSCILLATOR SYNC TERMINAL
. ADJUSTABLE DEADTIME CONTROL
. INTERNAL SOFT-START
. PULSE-BY-PULSE SHUTDOWN
. INPUT UNDERVOLTAGE LOCKOUT WITH
HYSTERESIS
. LATCHING PWM TO PREVENT MULTIPLE
PULSES
. DUAL SOURCE/SINK OUTPUT DRIVERS
DIP16
16(Narrow)
DESCRIPTION
The SG3525Aseries of pulse width modulator inte-
grated circuits are designed to offer improved per-
formance and lowered external parts count when
used in designing all types of switching power sup-
plies. The on-chip + 5.1 V reference is trimmed to ±
1 % and the input common-mode range of the error
amplifier includes the reference voltage eliminating
external resistors. A sync input to the oscillator al-
lows multiple units to be slaved or a single unit to be
synchronized to an external system clock. A single
resistor betweenthe CT andthe dischargeterminals
provide a wide range of dead time ad- justment.
Thesedevicesalso featurebuilt-insoft-startcircuitry
with only an external timing capacitor required. A
shutdownterminal controls both the soft-start circu-
ity and the output stages, providing instantaneous
turn off through the PWM latch with pulsed shut-
down, as well as soft-start recycle with longer shut-
down commands. These functions are also control-
led by an undervoltagelockoutwhich keepsthe out-
puts off and the soft-start capacitor discharged for
sub-normal input voltages. This lockout circuitry in-
cludesapproximately 500 mV of hysteresisfor jitter-
free operation. Another feature of these PWM cir-
cuits is a latch following the comparator. Once a
PWM pulses has been terminated for any reason,
the outputs will remain off for the duration of the pe-
riod. The latch is reset with each clock pulse. The
output stages are totem-pole designs capable of
sourcing or sinking in excess of 200 mA. The
SG3525Aoutputstage features NOR logic, giving a
LOW output for an OFF state.
PIN CONNECTIONS AND ORDERING NUMBERS (top view)
Type
SG2525A
SG3525A
Plastic DIP
SG2525AN
SG3525AN
SO16
SG2525AP
SG3525AP
June 2000
1/12
1 page  
TEST CIRCUIT
SG2525A-SG3525A
5/12
5 Page 
SG2525A-SG3525A
DIM.
mm
inch
MIN. TYP. MAX. MIN. TYP. MAX.
A 1.75 0.069
a1 0.1
0.25 0.004
0.009
a2 1.6 0.063
b 0.35
0.46 0.014
0.018
b1 0.19
0.25 0.007
0.010
C 0.5
0.020
c1 45° (typ.)
D (1) 9.8
10 0.386
0.394
E 5.8
6.2 0.228
0.244
e 1.27
0.050
e3 8.89
0.350
F (1) 3.8
4 0.150
0.157
G 4.6
5.3 0.181
0.209
L 0.4
1.27 0.016
0.050
M 0.62 0.024
S 8°(max.)
OUTLINE AND
MECHANICAL DATA
SO16 Narrow
(1) D and F do not include mold flash or protrusions. Mold flash or potrusions shall not exceed 0.15mm (.006inch).
11/12
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet SG3525A.PDF ] | |
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